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https://www.readbyqxmd.com/read/28195457/effect-of-entrapped-solvent-on-the-evolution-of-lateral-order-in-self-assembled-p-s-r-mma-ps-b-pmma-systems-with-different-thicknesses
#1
Tommaso Jacopo Giammaria, Federico Ferrarese Lupi, Gabriele Seguini, Katia Sparnacci, Diego Antonioli, Valentina Gianotti, Michele Laus, Michele Perego
Block copolymers (BCPs) are emerging as a cost-effective nanofabrication tool to complement conventional optical lithography because they self-assemble in highly ordered polymeric templates with well-defined sub-20-nm periodic features. In this context, cylinder-forming polystyrene-block-poly(methyl methacrylate) BCPs are revealed as an interesting material of choice because the orientation of the nanostructures with respect to the underlying substrate can be effectively controlled by a poly(styrene-random-methyl methacrylate) random copolymer (RCP) brush layer grafted to the substrate prior to BCP deposition...
February 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28165714/morphological-evolution-of-block-copolymer-particles-effect-of-solvent-evaporation-rate-on-particle-shape-and-morphology
#2
Jae Man Shin, Yongjoo Kim, Hongseok Yun, Gi-Ra Yi, Bumjoon J Kim
Shape and morphology of polymeric particles are of great importance in controlling their optical properties or self-assembly into unusual superstructures. Confinement of block copolymers (BCPs) in evaporative emulsions affords particles with diverse structures, including prolate ellipsoids, onion-like spheres, oblate ellipsoids, and others. Herein, we report that the evaporation rate of solvent from emulsions encapsulating symmetric polystyrene-b-polybutadiene (PS-b-PB) determines the shape and internal nanostructure of micron-sized BCP particles...
February 6, 2017: ACS Nano
https://www.readbyqxmd.com/read/28159720/biphasic-calcium-phosphate-ceramics-for-bone-reconstruction-a-review-of-biological-response
#3
REVIEW
J M Bouler, P Pilet, O Gauthier, E Verron
: Autologous bone graft is considered as the gold standard in bone reconstructive surgery. However, the quantity of bone available is limited and the harvesting procedure requires a second surgical site resulting in severe complications. Due to these limits, scientists and clinicians have considered alternatives to autologous bone graft. Calcium phosphates (CaPs) biomaterials including biphasic calcium phoshate (BCP) ceramics have proven efficacy in numerous clinical indications. Their specific physico-chemical properties (HA/TCP ratio, dual porosity and subsequent interconnected architecture) control (regulate/condition) the progressive resorption and the bone substitution process...
January 31, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28122854/early-to-mid-term-results-after-total-cavopulmonary-connection-performed-in-the-second-decade-of-life
#4
Alexandre Metras, Virginie Fouilloux, Mohammed Al-Yamani, Xavier Roques, Loic Macé, Jean-Benoît Thambo, Dominique Metras, Bernard Kreitmann, François Roubertie
OBJECTIVES: Total cavopulmonary connection (TCPC) performed in the second decade of life has rarely been studied. Thus, we investigated (bicentric study) early and late morbidity and mortality following completion of TCPC in these patients. METHODS: From January 1999 to June 2014, 63 patients (14.5 ± 2.9 years) underwent TCPC (extracardiac conduit). Palliation before completion was an isolated bidirectional cavopulmonary shunt (BCPS) in 3 patients or BCPS associated with additional pulmonary blood flow (APBF) that was either antegrade (Group 1) in 38 (63%) or retrograde (Group 2) in 22 (37%)...
January 25, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28093463/bidirectional-cavopulmonary-anastomosis-with-additional-pulmonary-blood-flow-good-or-bad-pre-fontan-strategy
#5
Nataliya R Nichay, Yuriy N Gorbatykh, Igor A Kornilov, Ilya A Soynov, Sergey M Ivantsov, Artem V Gorbatykh, Dmitriy N Ponomarev, Alexander V Bogachev-Prokophiev, Alexander M Karaskov
OBJECTIVES: This study aimed to evaluate the influence of preserved additional pulmonary blood flow (APBF) on survival after bidirectional cavopulmonary shunt (BCPS) and completion of Fontan circulation. METHODS: From March 2003 and April 2015, 156 patients with a single ventricle underwent BCPS. After performing propensity score analysis (1:1) for the entire sample, 50 patients with APBF (APBF group) were matched with 50 patients without APBF (no-APBF group). RESULTS: Age (P = 0...
January 15, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28068100/directed-self-assembly-of-polystyrene-b-poly-propylene-carbonate-on-chemical-patterns-via-thermal-annealing-for-next-generation-lithography
#6
Guan-Wen Yang, Guang-Peng Wu, Xuanxuan Chen, Shisheng Xiong, Christopher G Arges, Shengxiang Ji, Paul F Nealey, Xiao-Bing Lu, Donald J Darensbourg, Zhi-Kang Xu
Directed self-assembly (DSA) of block copolymers (BCPs) combines advantages of conventional photolithography and polymeric materials and shows competence in semiconductors and data storage applications. Driven by the more integrated, much smaller and higher performance of the electronics, however, the industry standard polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) in DSA strategy cannot meet the rapid development of lithography technology because its intrinsic limited Flory-Huggins interaction parameter (χ)...
January 27, 2017: Nano Letters
https://www.readbyqxmd.com/read/28067366/controlled-solvent-vapor-annealing-of-a-high-%C3%AF-block-copolymer-thin-film
#7
Ross Lundy, Shauna P Flynn, Cian Cummins, Susan M Kelleher, Maurice N Collins, Eric Dalton, Stephen Daniels, Michael A Morris, Ryan Enright
Molecular self-assembling block copolymers (BCPs) have shown promise as a next generation bottom-up lithography technology. However, a critical step in advancing this approach is the elimination of polymer dewetting due to bulk solvent nucleation and thermodynamically driven film rupture that can occur during the solvent vapor annealing process. We report on the pattern formation via phase segregation of spin coated diblock copolymer films through the investigation of annealing parameters in the limit of high solvent vapor saturation conditions that results in wafer-scale patterning without observing polymer dewetting defects...
January 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28051190/probe-into-the-influence-of-crosslinking-on-co2-permeation-of-membranes
#8
Jinghui Li, Zhuo Chen, Ahmad Umar, Yang Liu, Ying Shang, Xiaokai Zhang, Yao Wang
Crosslinking is an effective way to fabricate high-selective CO2 separation membranes because of its unique crosslinking framework. Thus, it is essentially significant to study the influence of crosslinking degree on the permeation selectivities of CO2. Herein, we report a successful and facile synthesis of a series of polyethylene oxide (PEO)-based diblock copolymers (BCP) incorporated with an unique UV-crosslinkable chalcone unit using Reversible Addition-Fragmentation Chain Transfer Polymerization (RAFT) process...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/27997119/anisotropic-self-assembly-of-hairy-inorganic-nanoparticles
#9
Chenglin Yi, Shaoyi Zhang, Kyle Thomas Webb, Zhihong Nie
Current interest in functional assemblies of inorganic nanoparticles (NPs) stems from their collective properties and diverse applications ranging from nanomedicines to optically active metamaterials. Coating the surface of NPs with polymers allows for tailoring of the interactions between NPs to assemble them into hybrid nanocomposites with targeted architectures. This class of building blocks is termed "hairy" inorganic NPs (HINPs). Regiospecific attachment of polymers has been used to achieve directional interactions for HINP assembly...
17, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/27991788/surfactant-mediated-crystallization-driven-self-assembly-of-crystalline-ionic-complexed-block-copolymers-in-aqueous-solution
#10
Zaizai Tong, Runke Zhang, Pianpian Ma, Haian Xu, Hua Chen, Yanming Li, Weijiang Yu, Wangqian Zhuo, Guohua Jiang
A series of crystalline/ionic complexed block copolymers (BCPs) with various compositions have been prepared by sequential reactions. The BCPs with different hydrophilic fractions can self-assemble into various morphologies, such as spindlelike, rodlike, and spherical micelles with different crystallinity of the core. Bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT) is added as a surfactant to induce the morphological transition of BCPs in aqueous media. The introduced AOT can be tightly bound to the cationic units, and a water-insoluble unit in the corona forms, leading to a reduced tethering density...
December 19, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27987036/characterization-of-a-bacterioferritin-comigratory-protein-family-1-cys-peroxiredoxin-from-candidatus-liberibacter-asiaticus
#11
Anamika Singh, Narender Kumar, Prabhat P S Tomar, Sumit Bhose, Dilip Kumar Ghosh, Partha Roy, Ashwani K Sharma
To defend against the lethality of the reactive oxygen species (ROS), nature has armed microorganisms with a range of antioxidant proteins. These include peroxiredoxin (Prx) super family proteins which are ubiquitous cysteine-based non-heme peroxidases. The phytopathogenic bacterium Candidatus Liberibacter asiaticus (CLA), an etiological agent of citrus plants diseases, posses many genes for defense against oxidative stress. The bacterioferritin comigratory protein (BCP), a member of Prxs, is part of an oxidative stress defense system of CLA...
December 16, 2016: Protoplasma
https://www.readbyqxmd.com/read/27981945/nanoscale-silicon-substrate-patterns-from-self-assembly-of-cylinder-forming-poly-styrene-block-poly-dimethylsiloxane-block-copolymer-on-silane-functionalized-surfaces
#12
Dipu Borah, Cian Cummins, Sozaraj Rasappa, Scott M D Watson, Andrew R Pike, Benjamin R Horrocks, David A Fulton, Andrew Houlton, George Liontos, Konstantinos Ntetsikas, Apostolos Avgeropoulos, Michael A Morris
Poly(styrene)-block-poly(dimethylsiloxane) (PS-b-PDMS) is an excellent block copolymer (BCP) system for self-assembly and inorganic template fabrication because of its high Flory-Huggins parameter (χ ∼ 0.26) at room temperature in comparison to other BCPs, and high selective etch contrast between PS and PDMS block for nanopatterning. In this work, self-assembly in PS-b-PDMS BCP is achieved by combining hydroxyl-terminated poly(dimethylsiloxane) (PDMS-OH) brush surfaces with solvent vapor annealing. As an alternative to standard brush chemistry, we report a simple method based on the use of surfaces functionalized with silane-based self-assembled monolayers (SAMs)...
January 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27960391/dual-functionality-fullerene-and-silver-nanoparticle-antimicrobial-composites-via-block-copolymer-templates
#13
Kyle J Moor, Chinedum O Osuji, Jae-Hong Kim
We present the facile prepartion of C70 and Ag nanoparticle (NP) loaded block copolymer (BCP) thin films, with C70 and Ag NPs working in tandem to provide virucidal and bactericidal activities, respectively. Polystyrene-block-poly-4-vinylpyridine (PS-P4VP) was used as a template, allowing C70 integration into PS domains and in situ formation of Ag NPs in P4VP domains, while providing control of the nanoscale spatial distribution of functionality as a function of BCP molecular weight (MW). C70 loaded PS-P4VP films were found to generate significant amounts of (1)O2 under visible light illumination with no apparent dependence on BCP MW...
December 14, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27862808/magneto-plasmonic-janus-vesicles-for-magnetic-field-enhanced-photoacoustic-and-magnetic-resonance-imaging-of-tumors
#14
Yijing Liu, Xiangyu Yang, Zhiqi Huang, Peng Huang, Yang Zhang, Lin Deng, Zhantong Wang, Zijian Zhou, Yi Liu, Heather Kalish, Niveen M Khachab, Xiaoyuan Chen, Zhihong Nie
Magneto-plasmonic Janus vesicles (JVs) integrated with gold nanoparticles (AuNPs) and magnetic NPs (MNPs) were prepared asymmetrically in the membrane for in vivo cancer imaging. The hybrid JVs were produced by coassembling a mixture of hydrophobic MNPs, free amphiphilic block copolymers (BCPs), and AuNPs tethered with amphiphilic BCPs. Depending on the size and content of NPs, the JVs acquired spherical or hemispherical shapes. Among them, hemispherical JVs containing 50 nm AuNPs and 15 nm MNPs showed a strong absorption in the near-infrared (NIR) window and enhanced the transverse relaxation (T2 ) contrast effect, as a result of the ordering and dense packing of AuNPs and MNPs in the membrane...
December 5, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27817953/mechanically-assisted-bidirectional-cavopulmonary-shunt-in-neonates-and-infants-an-acute-human-pilot-study
#15
Osami Honjo, Sandra L Merklinger, John B Poe, Anne-Marie Guerguerian, Hargen Zhang, Katherine L Taylor, Glen S Van Arsdell
OBJECTIVE: Poor survival following surgical palliation for hypoplastic left heart syndrome (HLHS) raises the question of the need for a paradigm shift. This is the first human study to investigate the possibility of primary "in-series" palliation in neonates and infants with HLHS in an acute setting with the aid of 2 types of mechanical assist: superior vena cava (SVC)-to-pulmonary artery (PA) pump assist and SVC-to-right atrium (RA) oxygenation assist. METHODS: By rearranging the cannula sites and flow rates for modified ultrafiltration, 2 types of mechanically assisted bidirectional cavopulmonary shunt (BCPS) circulation were simulated for 20 minutes...
September 28, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/27752237/discovering-antioxidant-molecules-in-the-archaea-domain-peroxiredoxin-bcp1-from-sulfolobus-solfataricus-protects-h9c2-cardiomyoblasts-from-oxidative-stress
#16
Carmen Sarcinelli, Gabriella Fiorentino, Elio Pizzo, Simonetta Bartolucci, Danila Limauro
Peroxiredoxins (Prxs) are ubiquitous thiol peroxidases that are involved in the reduction of peroxides. It has been reported that prokaryotic Prxs generally show greater structural robustness than their eukaryotic counterparts, making them less prone to inactivation by overoxidation. This difference has inspired the search for new antioxidants from prokaryotic sources that can be used as possible therapeutic biodrugs. Bacterioferritin comigratory proteins (Bcps) of the hyperthermophilic archaeon Sulfolobus solfataricus that belong to the Prx family have recently been characterized...
2016: Archaea: An International Microbiological Journal
https://www.readbyqxmd.com/read/27736809/uv-solvent-annealing-of-pdms-majority-and-ps-majority-ps-b-pdms-block-copolymer-films
#17
Keehong Lee, Melissa Kreider, Wubin Bai, Li-Chen Cheng, Saman Safari Dinachali, Kun-Hua Tu, Tao Huang, K Ntetsikas, G Liontos, A Avgeropoulos, C A Ross
The response of polystyrene-block-poly(dimethylsiloxane) (PS-b-PDMS) thin films to UV exposure during solvent vapor annealing is described, in order to improve their applicability in nanolithography and nanofabrication. Two BCPs were examined, one with the PS block as majority (f PS = 68%, M n = 53 kg mol(-1)), the other with PDMS block as majority (f PDMS = 67%, M n = 44 kg mol(-1)). A 5 min UV irradiation was applied during solvent vapor annealing which led to both partial crosslinking of the polymer and a small increase in the temperature of the annealing chamber...
October 13, 2016: Nanotechnology
https://www.readbyqxmd.com/read/27711642/stress-strain-behavior-of-block-copolymers-and-their-nanocomposites-filled-with-uniform-or-janus-nanoparticles-under-shear-a-molecular-dynamics-simulation
#18
Lu Wang, Hongji Liu, Fanzhu Li, Jianxiang Shen, Zijian Zheng, Yangyang Gao, Jun Liu, Youping Wu, Liqun Zhang
Although numerous research studies have been focused on studying the self-assembled morphologies of block-copolymers (BCPs) and their nanocomposites, little attention has been directed to explore the relation between their ordered structures and the resulting mechanical properties. We adopt coarse-grained molecular dynamics simulation to study the influence of the morphologies on the stress-strain behavior of pure block copolymers and block copolymers filled with uniform or Janus nanoparticles (NPs). At first, we examine the effect of the arrangement (di-block, tri-block, alternating-block) and the components of the pure block copolymers, and by varying the component ratio between A and B blocks, spherical, cylindrical and lamellar phases are all formed, showing that spherical domains bring the largest reinforcing effect...
October 5, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27700028/orientation-control-of-block-copolymers-using-surface-active-phase-preferential-additives
#19
Ankit Vora, Kristin Schmidt, Gabriela Alva, Noel Arellano, Teddie P Magbitang, Anindarupa Chunder, Leslie Thompson, Elizabeth Lofano, Jed W Pitera, Joy Y Cheng, Daniel P Sanders
Orientation control of thin film nanostructures derived from block copolymers (BCPs) are of great interest for various emerging technologies like separation membranes, nanopatterning, and energy storage. While many BCP compositions have been developed for these applications, perpendicular orientation of these BCPs domains is still very challenging to achieve. Herein we report on a new, integration-friendly approach in which small amounts of a phase-preferential, surface active polymer (SAP) was used as an additive to a polycarbonate-containing BCP formulation to obtain perpendicularly oriented domains with 19 nm natural periodicity upon thermal annealing...
October 4, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27696459/qtaim-and-stress-tensor-interpretation-of-the-h2-o-5-potential-energy-surface
#20
Tianlv Xu, James Farrell, Yuning Xu, Roya Momen, Steven R Kirk, Samantha Jenkins, David J Wales
Using the quantum theory of atoms in molecules a near complete combined directed spanning quantum topology phase diagram (QTPD) was constructed from the nine (H2 O)5 reaction-pathways and five unique Poincaré-Hopf solutions that were found after an extensive search of the MP2 potential energy surface. Two new energy minima that were predicted from earlier work are found and include the first (H2 O)5 conformer with a 3-DQT quantum topology. The stress tensor Poincaré-Hopf relation indicated a preference for 2-DQT (H2 O)5 topologies as well as the presence of coupling between shared-shell OH BCPs to the hydrogen-bond BCPs that share an H NCP...
December 5, 2016: Journal of Computational Chemistry
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